Product category:
Communications ICs (Wireless)
News Release from: Micrel | Subject: MICRF218
Edited by the Electronicstalk Editorial
Team on 26 February 2008
Programmable receiver avoids jamming
The MICRF218 is unique for its ability to "escape" from a jamming source and migrate to an alternative frequency.
Micrel has come up with the world's first programmable receiver IC to incorporate jam avoidance The MICRF218, which is part of Micrel's QwikRadio family, is targeted at garage door openers and tyre pressure monitoring systems
This article was originally published on Electronicstalk on 5 Dec 2000 at 8.00am (UK)
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"The MICRF218 is unique for its ability to 'escape' from a jamming source and migrate to an alternative frequency", says John Lee, Director of Mixed-Signal and RF Products, Micrel.
"This is a crucial feature due to recent homeland security measures deploying a new mobile radio system".
"This new radio system presents the possibility of jamming at the 390MHz frequency, a frequency also commonly used by garage door remote controls".
"The MICRF218 receiver system can avoid jamming by switching to a quieter frequency".
The MICRF218 can accommodate two reference crystals with the use of an external switch.
It features a fully integrated IF section with built-in image rejection.
The IF section has dual IF bandwidths that are externally selectable.
In addition, a wide IF bandwidth can be chosen for backward compatibility with older transmitters that are LC-based.
Wide IF bandwidth allows the receiver to capture a signal that slightly deviates from the intended communication frequency, or one can select a narrow IF bandwidth that operates with a crystal-based transmitter to improve selectivity to increase communication distance.
There is no sacrifice of performance with either option.
For tyre pressure monitoring system applications, a -40 to +125C operating temperature range can cause significant frequency deviation in the transmitter.
The MICRF218AYQS in wide IF bandwidth mode can accommodate transmitter signal drift due to temperature changes in the operating environment.
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